Biology, 16.10.2020 23:01 santos200154

You are given a 50 g sample of a gray mineral with a metallic luster and easily visible ortho-rhombic crystals. You are able to scratch it with your thumbnail, but doing so requires a considerable amount of pressure. When you suspend it in water from a spring scale, the spring scale reads 39 g. It leaves a gray streak on a porcelain tile. What mineral is this probably a sample of?

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